<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>

  <script src="https://cdn.bootcdn.net/ajax/libs/vue/2.7.14/vue.min.js"></script>
  <div class="app">
    <span>{{arr}}</span> === <span>{{obj}}</span>
    <button @click="shu">按钮</button>
  </div>
  <script>
    const app = new Vue({
      el: '.app',
      data: {
        arr: [1, 2, 3, 4, 5],
        obj: {
          num: 1
        }
      },
      methods: {
        shu() {
          this.$set(this.arr, 1, 2222);
          this.$set(this.obj,'name','rose')
        },

      },
    })
  </script>
</body>

</html>